Abstract

We report the investigation of the reduction of the group velocity propagation resulting from the steep change of the refractive index by the coherent population oscillation in an erbium ion-doped optical fiber. We study fully the influences of the ion density and the temperature on the fractional and time delay. We find that the fractional delay can be decreased at high or low temperature. Moreover, we conclude that the temperature can be used as a control parameter to reduce distortion.

Figures (5)

Modulation frequency and erbium ion density dependence of the fractional delay observed in propagation through 2m of erbium-doped optical fiber. The density of the erbium-doped ion is 5.4×1024, 1.6×1025, 3.2×1025, and 6.3×1025/m3, respectively. The lines represent the theoretical simulation results along with the experimental data point. The inset shows the normalized 5Hz input (solid line) and output (dashed line) signal. The signal is delayed 8.75ms, corresponding to a group velocity as low as 228.57m/s.